Internet bandwidth usage by Application

Hello Experts,

This may sound like a silly question but...

When a program (Say an E-mail APP or Web Mail APP) sends/receives data through the Internet , how is bandwidth utilized?

For Example:

Scenario 1 -  say there is a total of 256 Kb/sec available (no other programs open) .
Scenario 2 - Lots of other Internet activity (besides the e-mail program) and only 50 Kb/sec bandwidth available.

Will the e-mail program use the same amount of bandwidth (say 15 Kb/Sec) in Scenario 1 and Scenario 2 ?


Will the e-mail program utilize more bandwidth in Scenario 1 than Scenario 2?


Does the e-mail have a fixed bandwidth it is able/need to use (say 15 Kb/sec) and it will use that 15 Kb/sec bandwidth as long as (say 15 Kb/sec) is available?

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Kanti PrasadCommented:
Say you are trying to receive 5 mb of data with 1 megabits per sec bandwidth then the time 5 mb of data will take is 5 seconds and if you have 5 mb of bandwidth then 5mb data will take 1 second.

Providers claims of Speeds of bandwidth wary due to
      Dialup, and to some extent DSL are fixed speeds
      The more data you download then your internet get slower and slower as more space is used
      The further you are away you are from your ISP (hub) then your internet gets slower

You will find download speed of 5 mbps and an upload speed of 1 mbps . Since most users consume content rather than upload it, the bandwidth for download speeds is larger.

8  bits = 1 Byte

Say 1 Text Email might contain 5 mega bits of data then then for 1 mbps it will take 5 sec and with 5 mdps broad band it take 1 sec.

Say if you use 10 Min YouTube Video you might have used 50 mega bytes (50 * 1024 * 8 bits) of data download and if you used 30 Min of Gaming you might used 3 MB = 3 * 1024 * bits of data
SaxitalisAuthor Commented:
So if the e-mail only needs 15 kbs and the pip is wide open it will get to use its full 15 kbs?

but if the pipe is congested will the e-mail still go out at a slower (than 15 kb/) speed?
Kanti PrasadCommented:

If you have bandwidth in mbs then any kbs should not be any issue. If it is big files then speed at which it  will pass matters for eg if you have 1 kbs bandwidth then it will take 15 sec for your file pass through.

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SaxitalisAuthor Commented:
Thanks for the comments
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